VibeGrade
AI essay grader that lives inside Google Docs, Canvas and Google Classroom — one-click rubric grading with built-in plagiarism and AI-writing detection.
TL;DR
VibeGrade (still on the gradeassist.ai domain) is the most LMS-native of the AI essay-grader pack — it grades from inside Google Docs, Canvas SpeedGrader and Google Classroom without a separate upload step, then ships AI-writing detection (Pangram), plagiarism check and Playback Writing in the same extension. The free AI-detection and plagiarism tools alone make it worth installing.
Recommend it if
You grade essays inside Google Docs or Canvas SpeedGrader, you want rubric-aligned comments plus an academic-integrity check in one tool, or you need a free AI-detection tool you can hand to colleagues without a signup.
Skip it if
Your school is on Schoology, Blackboard or another non-Google / non-Canvas LMS, you only need lightweight feedback (Tallyrus / EssayGrader cost less), or you can't install Chrome extensions on managed devices.
Quick facts
- Platforms
- Chrome extensionEdge extensionWeb app
- Languages
- English
- School fit
- K-5 6-8 9-12 Higher Ed
- Subjects
- Essay-heavy subjects — EnglishHistorySocial StudiesWriting-intensive STEM
- Time to first output
- < 5 min
- Learning curve
- Easy
- Setup
- Install the Chrome extension, upload (or pick from library) your rubric, then grade from inside Docs or Canvas
- Works offline
- —
Real-world use cases
How a teacher, student or parent actually puts this tool to work.
| Who | Scenario | Time | Output |
|---|---|---|---|
| Teachers | Open a class set of 30 essays in Google Docs — click the VibeGrade extension on each; Smart Annotations + Grade Breakdown appear in 20 seconds per essay, you tweak and approve. | 12 min total | 30 essays graded with rubric comments + estimated grades |
| Teachers | Suspect AI use in a single essay — paste it into the free AI Writing Detection tool (no signup), get sentence-level Pangram analysis, then run Playback Writing on the original Doc to see if it was pasted in. | 3 min | Evidence pack before talking to the student |
| Teachers | Need a rubric you don't have — open the Rubric Library, find a shared rubric for "5-paragraph persuasive essay, Grade 9", upload it and start grading. | 2 min | Working rubric without writing one from scratch |
- Teachers
Open a class set of 30 essays in Google Docs — click the VibeGrade extension on each; Smart Annotations + Grade Breakdown appear in 20 seconds per essay, you tweak and approve.
- Time
- 12 min total
- Output
- 30 essays graded with rubric comments + estimated grades
- Teachers
Suspect AI use in a single essay — paste it into the free AI Writing Detection tool (no signup), get sentence-level Pangram analysis, then run Playback Writing on the original Doc to see if it was pasted in.
- Time
- 3 min
- Output
- Evidence pack before talking to the student
- Teachers
Need a rubric you don't have — open the Rubric Library, find a shared rubric for "5-paragraph persuasive essay, Grade 9", upload it and start grading.
- Time
- 2 min
- Output
- Working rubric without writing one from scratch
VibeGrade (the product, on the gradeassist.ai domain — yes, the naming is confusing) is the most LMS-native of the new AI essay-grader pack. It runs as a Chrome extension that fires up inside Google Docs, Canvas SpeedGrader, Toddle and Google Classroom — no exporting essays to a separate app. The two surfaces that make it stand out:
- Playback Writing — scrub through how the student actually typed the essay; pasted blocks show up as a discontinuity
- Pangram-powered AI detection — sentence-level, vendor-claimed unbiased against nonnative-English writers
Both of those, plus a Plagiarism Checker, are free without signup at gradeassist.ai/detect and gradeassist.ai/plagiarism-checker.
When it earns its slot in your stack
- You grade in Google Docs or Canvas SpeedGrader and currently switch tabs to a separate grader
- You want AI-writing detection + plagiarism + Playback Writing in one tool instead of subscribing to three
- Your district hasn’t approved a paid grading tool yet — the free AI-detection / plagiarism page is a useful wedge to demo the extension
What we like
- + Lives inside Google Docs, Canvas, Toddle and Google Classroom — no upload/download flow
- + Built-in AI-writing detection powered by Pangram (vendor-claimed "state-of-the-art, unbiased against nonnative speakers")
- + Playback Writing replays the student's writing process so you can spot AI-pasting and revision struggles
- + Grade estimate accuracy claimed within ±3% of teacher's final grade
- + Free AI-detection and plagiarism-checker tools available without signup
- + Compliant with COPPA, FERPA, SOPPA and state privacy laws per vendor
Heads up
- − Subscription pricing not shown on the homepage — must click through to a pricing page or contact sales
- − Branded as "GradeAssist" on the domain but "VibeGrade" everywhere else — confusing during procurement
- − Chrome/Edge extension only; no native Schoology / Blackboard integration
- − AI detection is always probabilistic — vendor itself warns teachers stay "in the driver's seat"
Pricing breakdown
Pricing
Verified directly on the vendor site. We re-check every quarter.
Free tools
- · AI Writing Detection (no signup)
- · Plagiarism Checker (no signup)
- · Playback Writing on Google Docs
- · Rubric Library — browse rubrics shared by other teachers
Subscription
Most useful- · Smart Annotations + Grade Breakdown across Docs, Canvas, Toddle, Classroom
- · One-click rubric grading with multi-AI access (ChatGPT, Gemini, Claude, Perplexity)
- · Cancel anytime; access through billing period
School / District
- · Volume pricing and implementation support
- · Vendor states no personally identifiable student information is required
- · Custom solutions for institutional procurement
Privacy & compliance
Privacy & compliance
What we found in the vendor's terms, DPA, and trust center. Verify with your district before deploying.
- FERPA
- Compliant
- SOC 2
- Unclear
- COPPA
- Compliant
- GDPR
- Unclear
- Trains on your data
- Unclear
- Data retention
- Not disclosed on the homepage. Visit the Privacy Center for the data-retention policy.
- Hosting regions
- US · AU
Vendor states compliance with COPPA, FERPA, SOPPA and US state privacy laws. Vendor also states VibeGrade "requires no personally identifiable student information". SOC 2 and explicit GDPR attestation are not stated on the public site — ask sales if your procurement requires them. AI Writing Detection is powered by third-party Pangram.
Works with
- Google Docs
- Google Classroom
- Canvas (SpeedGrader)
- Toddle
- Chrome browser
- Edge browser
Frequently asked questions
Frequently asked questions
Is it called GradeAssist or VibeGrade?
Both, and that's confusing. The domain is gradeassist.ai but the product is branded VibeGrade everywhere on the site, including the Chrome extension. Treat them as the same product.
How accurate is the AI detection?
VibeGrade uses Pangram for sentence-level AI detection. Pangram's marketing claims state-of-the-art accuracy and explicitly notes it's "unbiased against nonnative speakers" — a known failure mode of older detectors. Treat any AI detector as a signal, not a verdict; pair it with Playback Writing for stronger evidence.
How does it compare to CoGrader / EssayGrader / GradeWithAI?
VibeGrade's distinguishing surface is the in-LMS extension — it grades directly inside Google Docs and Canvas SpeedGrader, where CoGrader and EssayGrader pull essays out into their own app. VibeGrade also bundles AI-writing detection and Playback Writing for free; the others charge for or omit those. The trade-off is that the extension model means Chrome / Edge only.
Will VibeGrade replace teachers?
No — and the vendor explicitly says so in their own FAQ. The pitch is that VibeGrade speeds up grading while keeping the teacher in the driver's seat on rubric interpretation and final scoring.
How do schools buy it?
There is a school/district pricing page reachable from the homepage, but VibeGrade doesn't publish per-teacher pricing. Volume pricing, implementation support and custom packages are quote-based.
Tags
You might also like
When to pick it
CoGrader
★Grading & Feedback
Cuts essay grading time by ~80% with rubric-aligned AI feedback you can edit.
You'd rather grade essays in a dedicated dashboard than inside Docs or Canvas, or your school doesn't allow Chrome extensions on managed devices.
EssayGrader
Grading & Feedback
AI essay grading aligned to all 50 US state standards — 350 essays per month on the popular Pro tier.
You want a simpler tool with predictable per-teacher pricing and no LMS integration.